It’s like the farcical Fawlty Towers admonition not to mention the war; in the real world it could not be avoided. ‘Cost’ (the huge burden to be carried by all Australians) is the word studiously avoided by the Chief Judge of the NSW Land and Environment Court Brian Preston, in last month’s contentious judgment that potentially bans new coal mines and states that fossil fuels should remain in the ground in order to meet our Paris greenhouse emissions target.